Leases Other supplemental information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021		Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Operating cash flows from operating leases	$ 307		$ 299	$ 316
Operating cash flows from finance leases	38		32	51
Financing cash flows from finance leases	24		21	24
Right-of-Use Assets Obtained in Exchange for Operating Lease Liability	433	[1]	447	1,362
Right-of-Use Asset Obtained in Exchange for Finance Lease Liability	$ 6		$ 39	$ 74
Operating Lease, Weighted Average Remaining Lease Term	9 years 9 months 18 days		8 years 7 months 6 days	9 years 6 months
Operating Lease, Weighted Average Discount Rate, Percent	4.90%		4.10%	4.40%
Finance Lease, Weighted Average Remaining Lease Term	6 years 3 months 18 days		6 years 4 months 24 days	5 years 4 months 24 days

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